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Version 4.1 by Mengting Qiu on 2023/11/23 16:22
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Mengting Qiu 1.3 1 **Table of Contents:**
Mengting Qiu 1.2 2
Mengting Qiu 1.1 3 {{toc/}}
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Mengting Qiu 2.2 10 = 1. introduction =
Mengting Qiu 3.2 11
Mengting Qiu 3.3 12 This chapter describes switch LoRaWAN server by rejoin feature.
Mengting Qiu 3.2 13
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15 = 2. What is the rejoin feature? =
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Mengting Qiu 3.3 17 rejoin feature is that if the ACK packet sent by the platform to the node is not received within the set time range, the offline detection will be started.
Mengting Qiu 3.2 18
Mengting Qiu 3.3 19 == offline rejoining （LWS007) ==
Mengting Qiu 3.2 20
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22 (% style="color:blue" %)**AT Command: AT+DDETECT**
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24 AT+DDETECT=<Flag>,<ACK_Timout_1>,<ACK_Timout_2> (Default Value: AT+DDETECT=1,1440,2880)
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26 * ACK_Timout_1: Unit: min
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28 * ACK_Timout_2: Unit: min
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30 (% border="1" style="background-color:#f2f2f2; width:562px" %)
31 |(% style="background-color:#4f81bd; color:white; width:160px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:272px" %)**Function**|(% style="background-color:#4f81bd; color:white; width:89px" %)**Response**
32 |(% style="width:160px" %)(((
33 AT+DDETECT=1,1440,2880
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35 value1
36 )))|(% style="width:272px" %)Enable online detect|(% style="width:89px" %)(((
37 1
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39 OK
40 )))
41 |(% style="width:160px" %)(((
42 AT+DDETECT=1,?,2880
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44 value2
45 )))|(% style="width:272px" %)Online detection packet sending time|(% style="width:89px" %)(((
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48 OK
49 )))
50 |(% style="width:160px" %)(((
51 AT+DDETECT=1,1440,？
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53 value3
54 )))|(% style="width:272px" %)Process rejoin|(% style="width:89px" %)(((
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57 OK
58 )))
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60 (% style="color:blue" %)**Downlink Command: 0x32**
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62 Format: Command Code (0x32) followed by 2 bytes mode value.
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64 If the downlink payload=320105A00B40, it means set end node to use confirm mode, while type code is 32.
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66 * **Example 1:** Downlink Payload: 320105A00B40  ~/~/ Set AT+DDETECT=1,1440,2880
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Mengting Qiu 3.6 68 *
Mengting Qiu 3.2 69 ** 0x01** : Flag**
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71 **0x05A0 **: ACK_Timout_1 : 1440minutes (24 hours)
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73 **0x0B40 **: ACK_Timout_2 : 2880minutes (48 hours)
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75 * **Explain**: Enable Online Detect, if end node doesn't receive any downlink within ACK_Timout_1( 1440 minutes or 24 hours). End node will use confirmed uplink to send packets during ACK_Timout_1 (the 24th hour) to ACK_Timout_2 ( the 48th hour). If from the 24th to 48th hour, end node got an downlink from server, it will switch back to unconfirmed uplink. end node will restart ACK_Timout_1. If from the 24th to 48th hour, end node still not got any downlink, means device doesn't get ACK from server within last 48 hours. Device will process rejoin, rejoin request interval is AT+RJTDC period. For AU915/ US915, device will use the sub-band used for last join.
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77 (% style="display:none" %) (%%)
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Mengting Qiu 3.6 79 = 3. Examples and Explanations =
Mengting Qiu 3.2 80
Mengting Qiu 3.6 81 (% style="color:blue" %)**Switching platforms by rejoin function: Use device LHT65N to switch from TTN to ChirpStack as an example.**
Mengting Qiu 3.2 82
Mengting Qiu 3.6 83 The following example shows the parameters of the LHT65N. Users need to check the Wiki instructions to confirm the parameters of the equipment they have purchased.
84 ([[User Manual for LoRaWAN End Nodes)>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes]])
Mengting Qiu 3.2 85
Mengting Qiu 3.6 86 == 3.1 Configure appropriate operation times ==
Mengting Qiu 3.2 87
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Mengting Qiu 3.6 89 Firstly, the user sent downlink commands through the original registration platform (TTN) to modify the required TDC time and offline detection time.
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